morbidity

The noun morbidity means "the quality of being unhealthful." If you can't watch your sister's morbidity get any worse, you might sign her up with a nutritionist and a personal trainer.

Morbidity comes from the word morbid, which means "or of relating to disease," like the number of cases of any disease in an areas — morbidity rates for polio that plummeted in the 20th century. Morbidity can also mean "fixated on death or having an abnormally gloomy state of mind," like the increasing morbidity of an older person whose family and friends have all passed on.